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Study published by the Walker Group reveals how neurons in the auditory cortex represent pitch

Representations of sound stimuli are plotted above, with the positions of pitch-selective neurons in ferret auditory cortex mapped below. The study found that subset of neurons represent the pitch of complex sounds based on harmonic content (left), another subset based on temporal periodicity (right), and a third population exhibited invariant pitch tuning across both cue classes (middle).
Representations of sound stimuli are plotted above, with the positions of pitch-selective neurons in ferret auditory cortex mapped below. The study found that subset of neurons represent the pitch of complex sounds based on harmonic content (left), another subset based on temporal periodicity (right), and a third population exhibited invariant pitch tuning across both cue classes (middle).

A new study published by the Walker Group in Current Biology has revealed how neurons in the auditory cortex represent pitch. Pitch is the tonal quality of sound that allows us to follow a musical melody, understand speech, and focus on one voice in a crowded room. Despite its critical role in hearing, the neural mechanisms underlying pitch perception remain unclear.

In the study, Veronica Tarka (DPhil student, DPAG), Quentin Gaucher (former postdoc in DPAG and current Lecturer at Sorbonne Université, Paris) and Kerry Walker (Associate Professor, DPAG) recorded the activity of hundreds of neurons in the auditory cortex of ferrets. They independently varied two sources of pitch information: the harmonic structure of a sound and the periodicity of its waveform in time. They identified distinct groups of neurons that encoded pitch using each type of cue, alongside a third population that could generalize pitch across both cue types.

These findings help explain how the brain forms a stable perception of pitch, allowing us, for example, to recognize a familiar melody when it is played on different instruments. The research could ultimately inform the development of improved cochlear implants, which currently fail to restore pitch perception.

https://www.cell.com/current-biology/fulltext/S0960-9822(26)00721-9

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